We'll sketch it from 0 to . If you are allowed to use a calculator or a trigonometric table, find some points and place them. Find where the graph intersects the x-axis. Then, if you know how to do, find the vertical asymptotes.

As , the vertical asymptotes will be at , which makes the tangent .

So,
We'll just need , as .

So, the vertical asymptotes are at and . You can use one sided limits to find how do these asymptotes look like.

You can find the critical points and find whether the graph increases or decreases using first and second derivatives. Or if you have enough points to guess how the graph looks like, you can finish it now.